No tips but – the last time I did the Simpson's pull-through trip our rope jammed on the Slit Pot alternative (over the top), so as I was the lightest person present I was 'volunteered' to climb back up to try to release it; my friends belayed the rope to themselves to (more than) counterbalance my weight. Anyway, I got to a point where I was shouting instructions to the two people down below, but they couldn't hear me, and they set off towards me – up the 'steps' at the bottom of the pitch; as they came up, the rope freed itself . . . . . and I went down . . . a very disconcerting experience!